AU545307B2 - Variable focal length projection lens - Google Patents

Variable focal length projection lens

Info

Publication number
AU545307B2
AU545307B2 AU82655/82A AU8265582A AU545307B2 AU 545307 B2 AU545307 B2 AU 545307B2 AU 82655/82 A AU82655/82 A AU 82655/82A AU 8265582 A AU8265582 A AU 8265582A AU 545307 B2 AU545307 B2 AU 545307B2
Authority
AU
Australia
Prior art keywords
focal length
projection lens
variable focal
length projection
variable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU82655/82A
Other versions
AU8265582A (en
Inventor
Dennis Frank Vanderwerf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of AU8265582A publication Critical patent/AU8265582A/en
Application granted granted Critical
Publication of AU545307B2 publication Critical patent/AU545307B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)
  • Overhead Projectors And Projection Screens (AREA)
AU82655/82A 1981-04-16 1982-04-15 Variable focal length projection lens Ceased AU545307B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/254,947 US4380374A (en) 1981-04-16 1981-04-16 Variable focal length projection lens for use on overhead projectors
US254947 1981-04-16

Publications (2)

Publication Number Publication Date
AU8265582A AU8265582A (en) 1982-10-21
AU545307B2 true AU545307B2 (en) 1985-07-11

Family

ID=22966203

Family Applications (1)

Application Number Title Priority Date Filing Date
AU82655/82A Ceased AU545307B2 (en) 1981-04-16 1982-04-15 Variable focal length projection lens

Country Status (9)

Country Link
US (1) US4380374A (en)
EP (1) EP0063425B1 (en)
JP (2) JPS57181517A (en)
AU (1) AU545307B2 (en)
BR (1) BR8202173A (en)
CA (1) CA1178834A (en)
DE (1) DE3264517D1 (en)
IE (1) IE52987B1 (en)
ZA (1) ZA822579B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573936B2 (en) * 1984-12-14 1988-06-23 Philips Electronics N.V. Projection lens system
AU573935B2 (en) * 1984-12-14 1988-06-23 Philips Electronics N.V. Projection lens system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832465A (en) * 1985-08-14 1989-05-23 Asahi Kogaku Kogyo Kabushiki Kaisha Zoom lens for use in copying
US4744641A (en) * 1987-06-01 1988-05-17 Minnesota Mining And Manufacturing Company Telephoto lens assembly for overhead projector
JPH0671727B2 (en) * 1988-01-18 1994-09-14 マツダ株式会社 Slicing machine and control method thereof
DE19648620C2 (en) * 1996-11-12 1998-10-29 Mannesmann Ag Lighting system for illuminating an adjustable lighting field
US8105756B2 (en) 2009-02-17 2012-01-31 E. I. Du Pont De Nemours And Company Method for preparing a printing form using vibrational energy
RU2655622C1 (en) * 2017-02-02 2018-05-29 Открытое Акционерное общество "Ростовский оптико-механический завод" Lens
CN109491049B (en) * 2018-12-26 2023-08-29 歌尔光学科技有限公司 Projection optical system and augmented reality glasses with same
CN114859515B (en) * 2022-05-23 2024-01-12 张家港中贺自动化科技有限公司 Catadioptric objective optical system for projection lithography and projection lithography system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3357775A (en) * 1961-11-13 1967-12-12 Minnesota Mining & Mfg Projection objective affording variable magnification
US3408135A (en) * 1966-04-12 1968-10-29 Minnesota Mining & Mfg Projective objective having three elements plus an integral right angle prism
GB1216581A (en) * 1968-01-01 1970-12-23 Omal Group Ltd Improvements in overhead projectors
SE382262B (en) * 1974-05-29 1976-01-19 Lindaco Ltd PROJECTION OPTICS.
US4311366A (en) * 1978-03-01 1982-01-19 J. H. Dallmeyer Limited Image focusing system
JPS5813887B2 (en) * 1979-06-20 1983-03-16 旭光学工業株式会社 Copying variable magnification lens system
US4350415A (en) * 1980-09-02 1982-09-21 Minnesota Mining & Manufacturing Company Auxiliary lens system for overhead projectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573936B2 (en) * 1984-12-14 1988-06-23 Philips Electronics N.V. Projection lens system
AU573935B2 (en) * 1984-12-14 1988-06-23 Philips Electronics N.V. Projection lens system

Also Published As

Publication number Publication date
CA1178834A (en) 1984-12-04
US4380374A (en) 1983-04-19
ZA822579B (en) 1983-04-27
JPS57181517A (en) 1982-11-09
EP0063425B1 (en) 1985-07-03
IE52987B1 (en) 1988-04-27
JPH0373909U (en) 1991-07-25
EP0063425A1 (en) 1982-10-27
BR8202173A (en) 1983-03-29
IE820893L (en) 1982-10-16
DE3264517D1 (en) 1985-08-08
AU8265582A (en) 1982-10-21

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